Jeff Weinberg, W8CQ

Your World-Wide Source For Amateur Radio Amplifier Parts & Upgrade Kits

Your World-Wide Source For Amateur Radio Amplifier Parts & Upgrade Kits
12 July 2021: Due to a flood at my home/shop, Harbach Electronics is closed until I get this mess cleaned up and all of the damage repaired. Effective immediately I will be closed for 30-60 days or how ever long it takes to clean up and repair the damage. All pending orders will be canceled and refunded via the method of payment. I am sorry for the closure but I have to get things repaired and cleaned up. I will be back but it will be a little while. If you wish to order Dean Jacobs racing gear, please email me at and send me your phone number and I will contact you and process your order.
You can still view products, but no orders are being taken at this time. Sorry for the inconvenience!

PM-400 Replacement Power Supply Module


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The PM-400 is a complete replacement power supply module for the Drake L-4/L-4B/L-7 remote power supply. It is designed around and features new modern 220 μF 450VDC electrolytic capcitors, 1000 PIV 3A diodes, new 100K 3W bleeder resistors.  The unit installs easily in the remote power supply chassis and replaces both of the old diode/capacitor boards. You may purchase the printed circuit board and insulating fish paper (for those customers who wish to supply their own capacitors, diodes and resistors) or the complete kit.

Additional information

Weight 0.90 lbs
Dimensions 8.5 × 5.5 × 2.0 in
Kit Type

PC Board & Fish Paper, Complete Kit